Prolite Apex Large

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Product Overview


New For 2019: Boasting an unrivaled warmth-to-weight ratio, the Apex is the pinnacle of light and stable self-inflating comfort.

The  newest addition to our tried-and-true ProLite family adds warmth and  thickness without adding additional weight. The lightweight Apex offers  year-round warmth and comfort thanks to its unique StrataCore construction. The two-inch thick mattress ensures that you stay comfy during your backpacking adventures. Stuff sack included.     


  • StrataCoreā„¢ Construction:  Yielding the best warmth-to-weight ratio of any self-inflating  mattress, StrataCore uses a continuous layer of thermal foam nestled  between alternating ridges of air and foam.
  • Lightweight Year-Round Comfort: Perfect for everything from winter adventures to summer backpacking.
  • Comfy Self-inflating Foam: Expanding foam core self-inflates; top off with air for personalized firmness on (5 cm) of StrataCore loft.
  • Easily Fits In Your Pack: Packs down small to easily find a place in your pack during fast and light adventures. 

  Regular Regular Wide Large     R-Value 4 4 4   Weight (Standard) 1 lbs 6 oz 1 lbs 12 oz 1 lbs 14 oz   Weight (Metric) 0.63 kg 0.79 kg 0.85 kg   Width (Standard) 20 in 25 in 25 in   Width (Metric) 51 cm 63 cm 63 cm   Length (Standard) 72 in 72 in 77 in   Length (Metric) 183 cm 183 cm 196 cm   Thickness (Standard) 2 in 2 in 2 in   Thickness (Metric) 5 cm 5 cm 5 cm   Packed dimension (Metric) 28 cm x 12 cm 33 cm x 13 cm 33 cm x 13 cm   Packed dimension (Standard) 11 in x 4.8 in 13 in x 5.1 in 13 in x 5.1 in   Top fabric type 50D polyester 50D polyester 50D polyester   Bottom fabric type 50d Polyester 50d Polyester 50d Polyester   Foam type Urethane Foam Urethane Foam Urethane Foam   Country of Origin USA*Built of the Finest U.S. and Global Materials USA*Built of the Finest U.S. and Global Materials 


Limited Lifetime Warranty

Every piece of Therm-a-Rest gear is  designed to endure the rigors of your time in the backcountry. We offer a  Limited Lifetime Warranty on all products, except electronic devices,  which have a 2-year Limited Warranty. 

Better Sleep Guarantee

All Therm-a-Rest sleeping bags and quilts are also  covered by our Better Sleep Guarantee. When you wake up on a  Therm-a-Rest sleeping bag or quilt, we're confident you'll wake up  feeling better than ever. If you are not completely satisfied, return it  within three months with the original receipt of purchase and we will  give you a full refund- no questions asked. To get your gear repaired, start a warranty claim or to learn more, visit for more info.  


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